Double acting pump



April 1939- c. J. SCHENK 7 2,153,974

DOUBLE ACTING PUMP Filed May 12, 1937 2 Sheets-Sheet l \j-i m4," hy I l I i i clzzzz-z 7 v :JLgrJ [Zak/w JLSZ%e/% ATTORNEYS April 11, 1939. Q J SCHENK 2,153,974

DOUBLE ACTING PUMP Fil ed May 12, 1937 2 Sheets-Sheet 2 ENTOR ATTORNEYS Patented Apr. 11, 1939 U NIT E D ST 3 Claims.

The invention relates to adouble acting pump and more especially to refinements over the .sub-

ject matter of United States Letters Patent 'No. 1,322,479 issued November 18, 1919.

The primary object of the invention is the provision of a pump of this character, wherein through a specially designed pump head a continuous uniform flow will be assured and long stroke double action effects the continuous uniform flow from a well.

Another object of the invention is the provision of a pump of this character, wherein the force of the descending pump rods will be absorbed thus relieving shock and vibration from the head of the pump.

A further object of the invention is the provision of a pump of this character, wherein refinements are involved over the subject matter of United States Letters Patent No. 1,322,470 and a positive and perfect working of the pump is :assured.

Withthese and-other objects in view, the invention consists in the features of construction, combination and arrangement of parts as will be hereinafter-more fully described, illustrated in the accompanying drawings, which disclose the preferred embodiment of the invention and pointed out in the-claims hereunto appended.

In the accompanying drawings:

Figure lis a front elevation partly in section of the pump head embodying the refinements andin accordance with the invention.

Figure 2 is a side elevation thereof, the same being partly in section.

Figure 3 is a top plan View.

Figure 4 15 a sectional view on the line 4-4 of Figure 2 looking in the direction of the arrows.

Figure 5'is a sectional view on the line 5-5 of Figure .2 looking in the direction of the arrows.

Figure .6 is a fragmentary vertical transverse sectional view showing in detail the shock absorbing means.

Figure '7 is a fragmentary side elevation showing in detail the mutilated gears and gear racks with the latch means associated therewith.

Similar reference characters indicate corresponding parts throughout "the several views in the .drawings.

Referring to thedrawings in detail, It designates generally a base for a pump and preferablyis rectangular in plan, the upper end of the pump casing 1! being supported thereby. A

spout 12 leads the liquid :from the pump casing Ill and rising from this base i8 is a pumphead involving refinements over the subject matter nectthe'posts l5 and lfi'together.

of United .States Letters Patent No. 1,322,470

issued November 18, 1919, and hereinafter fully described.

The pump head comprises upstanding posts 13 and l lwhich are rigidlymounted upon one side of the *base ll] and similar posts 15 and 56 are rigidly mounted upon the other side of the said *base.

A brace ll connects the upper ends of the posts 13 and M, a brace l8 connects the intermediate portions 'of the postsand a brace 59 connects the lower ends. Similar braces con- Guide rollers 29, 2! and 22 are mounted between the upper "ends of the posts '14 and 16 upon a spindle 23. Similar guide rollers 24, 25 and 26 are mounted some distance .below the spindle 23'upon a spindle 2?. The rollers 22 and 26 are in a vertical line, the rollers 2| and 25 are in avertical line and the.rollers 29 and 24 are in 'a vertical line.

The inner pump rod .28 works inside of the outer pump rod 29 and the latter pump rod works through-a stufiing-box construction 39 fixed at the upperend of the pump casing l I. A gear rack 31 is connected to the upper end of the inner pump rod 28 by clamps and bolts 32. The gear racks 33 and 34 are connected to the upper end of the outer pump rod 29 by clamps and bolts 35. The gear racks 3!, 33 and 34 are slightly-spaced apart in parallel relation and in a straight line. The back smooth side of the gear rack 3! runs on the rollers 2| 'and 25 and the back smooth sides of the gear racks 33 and 34 run on the rollers 20, 24, 22 and 25. The gear teeth of the racks 'are at the opposite sides from the smooth sides'which runupon the rollers, the rollers serving to hold the racks'in their'proper tracks to mesh with l the mutilated gears.

The lifting shaft 36 is mounted in the braces IS. A drive pulley 31 is fixed upon the outer end of the drive shaft 42. The mutilated gear 38 is fixed upon the lifting shaft 26 in line with the gear racks-said mutilated gear having a segment 39 meshing with the gear rack 3! and segments iii! and M meshingwith the gear racks 33 and 34.

A driving shaft 42 is mounted in the braces I8 44 is fixed upon the driving shaft 42 in a plane at one side of the gear racks. An idle gear 45 is mounted upon an idle shaft 46, said idle shaft being :mounted in bearings near the upper ends 'of the posts l3 andl5-and-the idle gear-45 meshing with the pinion 44 and a gear 41. The gear 4'! is fixed upon one side of the mutilated gear 48 by bolts 49 extending through slots 50 so that the gear 41 may be adjusted relative to the mutilated gear 48 to the limits of the slots. The mutilated gear 48 is mounted upon a shaft and the shaft is mounted in bearings at the upper end of the posts l3 and I5. The mutilated gear 48 has a segment 52 adapted to mesh with the gear rack 3| and, segments 53 and 54 adapted to mesh with the gear racks 33 and 34.

The lifting shaft 3| carrying the mutilated gear 38 moves in the direction indicated by the arrow 55 and the driving shaft 42 carrying the gears 43 and 44 moves in the opposite direction as indicated by the arrow 56 and the idle gear 45 meshing with the gear goes in the direction indicated by the arrow 51 and the mutilated gear 48 moves in the direction indicated by the arrow 58 so that the mutilated gear 38 moves in the opposite direction from the mutilated gear 48.

Between the segments 48 and 4| is a space 53 which is continued to the ends of the segment 33. In a like manner there is a space 60 between the segments 53 and 54 while between the ends of the said segments 53 and 54 and the ends of the segment 52 are the gaps 5|. The racks 33 and 34 serve the purpose of a single rack, the object being to divide the strain and balance the pull upon the outer pump rod 29 and in a like manner the segments 48 and 4| and 53 and 54 serve the purpose of single segments.

The gears and racks are set and timed so that the mutilated gear 38 drives the racks 3|, 33 and 34 upwardly and the mutilated gear 48 drives the racks downwardly so that when the segment 38 is enmesh with the rack 3| and driving this rack upwardly to raise the pump rod 28 the segments 53 and 54 are enmesh with the racks 33 and 34 and driving the racks downwardly to lower the outer pump rod 29, and when the segment 39 reaches the end of the down stroke the segment takes hold of the rack 3| and starts the up stroke of the inner pump rod 28 and in a like manner when the segments 43 and 4| reach the end of the up stroke of the racks 33 and 34 the segments 53 and 54 take hold and start the down stroke.

Formed in each of the racks 33 and 34 is break 62 forming a relatively wide separation between the teeth 53 and 64 thereon which mesh with the segments 45 and 4| and the segments 53 and 54, respectively.

Each of the segments 53 and 54, considerably removed from its advancing end, is formed with a relatively wide break 55 in which works a swinging latching dog 66 pivoted at 67 for its swinging movement which together with the end 63 next thereto of each segment 53 and 54 constitutes a suificiently wide tooth formation to be accommodated in the break 62 to avoid the shock which would otherwise result when the segments 40 and 4| run out of mesh and the segments 53 and 54 run into mesh, thereby reversing the motion of the racks. In a like manner a latching dog 59 and a wide space or break 15 for the said dog is provided with the segment 52 to mesh with the corresponding break in the rack 3|.

These latching dogs 65 and 69 allow for the change from the upward movement of the racks 33 and 34 to the downward movement without any shock and without any danger of breaking the gear teeth.

The segment 39 of the mutilated gear 38 overlaps at both ends with the segments 40 and 4| as at H and in the operation of the pump head the column of liquid flowing from the pump will move continuously and uniformly, there being a double acting long stroke operation in effecting the continuously uniform flow of liquid.

Arranged cross wise of the braces l'i next to the racks 3|, 33 and 34 is a plate 72 in which are fixed hanger bolts 73 carrying coiled shock absorbing springs 14 against which rests a block 15 which is guided upon the bolts '13 and with which engage the abutment terminals 16 at the upper ends of the racks 3 l, 33 and 34, the purpose of the springs 74 and the blocks 15 is to absorb the force of the downward descent of the rods 28 and 29 and to ease these while the springs 2'3 under their tension will start the up stroke of the said rods.

What is claimed is:

1.. The combination of a single intermediate and a pair of outer mating toothed racks ar ranged side by side, a mutilated toothed gear alternately meshing with the intermediate and outer racks for raising the same upwardly or alternately in their order, second mutilated toothed gear for meshing with the racks for alternately lowering the same in their order, said racks having relatively long breaks at intervals therein between the teeth of the same, and relatively wide tooth-like latching detents swingingly connecteto and straddling the last-mentioned gear, being inset in the latter for engaging in the breaks in the racks and. effecting the change from the upward movement to the downward movement thereof without any shock and without danger of breaking the teeth of the said gear, each of said latching detents being eccentrically pivoted and of an extent in associalion with portions adjacent thereto of the gear substantially equal to the break companion thereto.

2. The combination of a single intermediate and a pair of outer mating toothed racks arranged side by side, a mutilated toothed gear alternately meshing with the intermediate and outer racks for raising the same upwardly or alternately in movement to the downward movement thereof without any shock and without danger of breaking the teeth of the said gear, and adjustable gear connections between the mutilated gears for continuous operation thereof, each of said latching detents being eccentrically pivoted and of an extent in association with portions adjacent thereto of the gear substantially equal to the break companion thereto.

3. The combination of a single intermediate and a pair of outer mating toothed racks arranged side by side, a mutilated toothed gear alternately meshing with the intermediate and outer racks for raising the same upwardly or alternately in their order, a second mutilated toothed gear for meshing with the said racks for alternately lowering the same in their order, said racks having relatively long breaks at intervals therein between the teeth of the same, relatively wide tooth-like latching detents swingingly connected to and straddling the last-mentioned gear, being inset in the latter for engaging in the absorbing springs acting against said block and suspended beneath the latter, and means holding the block in the path of the said abutment terminals and carrying said springs, each of said latching detents being eccentrically pivoted and 5 of an extent in association with portions adjacent thereto of the gear substantially equal to the break companion thereto.

CHARLES J. SCHENK. 

